Don't fall for special ointments as treatment for hair loss. The only topical treatment that works is Rogaine (minoxidil), which is applied as a shampoo. While it's better at keeping the hair you already have, it does help some hair to regrow on the scalp.
Believe it or not, these days it's possible to use a laser to encourage hair growth. The practitioner uses a low-power micro-laser to stimulate the blood flow in the hair follicles. It's more a way to keep the hair you have than a hair replacement method, but it can be an effective complementary therapy.